Title: The simulation for ultrasonic testing based on frequency-phase coded excitation

Authors: Xinyu Zhao; Jiaying Zhang; Sen Cong; Tie Gang

Addresses: School of Material Science and Engineering, Dalian Jiaotong University, 794 Huanghe Road, Dalian, 116028, China ' School of Material Science and Engineering, Dalian Jiaotong University, 794 Huanghe Road, Dalian, 116028, China; State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China ' Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang, 621900, China ' State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China

Abstract: Large time-bandwidth product coded signal and pulse compression are introduced into ultrasonic testing. Linear frequency modulation (LFM) excitation is usually used to improve time resolution, but sidelobe should be suppressed to detect smaller flaws nearby. Barker coded excitation is usually used to suppress sidelobe, but time resolution of results is lower than LFM excitation. So frequency-phase coded excitation is proposed to obtain higher time resolution and lower sidelobe level. The proposed excitation signal is applying LFM to each sub-pulse of Barker code, and it is called LFM-B₁₃. The results of simulations demonstrate that, time resolution of LFM-B₁₃ excitation is approximately 40% higher than that of LFM excitation, and main sidelobe level of LFM-B₁₃ excitation is approximately 4 dB lower than that of LFM excitation, when 60% bandwidth of 5 MHz central frequency transducers are used.

Keywords: simulation; ultrasonic testing; coded excitation; pulse compression; K-wave.

DOI: 10.1504/IJCMSSE.2019.101664

International Journal of Computational Materials Science and Surface Engineering, 2019 Vol.8 No.1, pp.37 - 47

Accepted: 10 Nov 2018
Published online: 20 Aug 2019 *

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